Develop Reference

More than 1 object in a single JFrame

I'm hoping someone can push me in the right direction with this. I have 3 separate classes, Calculator, Calculator2, and a Calculator3. In principal they are all the same, except for a few changes to some of the buttons, so I'll just paste the code for Calculator. I was wondering how can I get them so all appear in a single JFrame next to each other in a main? I attached my most recent attempt of the main as well.
Here is Calculator:
public class Calculator implements ActionListener {
private JFrame frame;
private JTextField xfield, yfield;
private JLabel result;
private JButton subtractButton;
private JButton divideButton;
private JButton addButton;
private JButton timesButton;
private JPanel xpanel;
public Calculator() {
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
xpanel = new JPanel();
xpanel.setLayout(new GridLayout(3,2));
xpanel.add(new JLabel("x:", SwingConstants.RIGHT));
xfield = new JTextField("0", 5);
xpanel.add(xfield);
xpanel.add(new JLabel("y:", SwingConstants.RIGHT));
yfield = new JTextField("0", 5);
xpanel.add(yfield);
xpanel.add(new JLabel("Result:"));
result = new JLabel("0");
xpanel.add(result);
frame.add(xpanel, BorderLayout.NORTH);
/***********************************************************************
***********************************************************************
**********************************************************************/
JPanel southPanel = new JPanel(); //New panel for the artimatic buttons
southPanel.setBorder(BorderFactory.createEtchedBorder());
timesButton = new JButton("Multiplication");
southPanel.add(timesButton);
timesButton.addActionListener(this);
subtractButton = new JButton("Subtract");
southPanel.add(subtractButton);
subtractButton.addActionListener(this);
divideButton = new JButton("Division");
southPanel.add(divideButton);
divideButton.addActionListener(this);
addButton = new JButton("Addition");
southPanel.add(addButton);
addButton.addActionListener(this);
frame.add(southPanel , BorderLayout.SOUTH);
Font thisFont = result.getFont(); //Get current font
result.setFont(thisFont.deriveFont(thisFont.getStyle() ^ Font.BOLD)); //Make the result bold
result.setForeground(Color.red); //Male the result answer red in color
result.setBackground(Color.yellow); //Make result background yellow
result.setOpaque(true);
frame.pack();
frame.setVisible(true);
}
/**
* clear()
* Resets the x and y field to 0 after invalid integers were input
*/
public void clear() {
xfield.setText("0");
yfield.setText("0");
}
#Override
public void actionPerformed(ActionEvent event) {
String xText = xfield.getText(); //Get the JLabel fiels and set them to strings
String yText = yfield.getText();
int xVal;
int yVal;
try {
xVal = Integer.parseInt(xText); //Set global var xVal to incoming string
yVal = Integer.parseInt(yText); //Set global var yVal to incoming string
}
catch (NumberFormatException e) { //xVal or yVal werent valid integers, print message and don't continue
result.setText("ERROR");
clear();
return ;
}
if(event.getSource().equals(timesButton)) { //Button pressed was multiply
result.setText(Integer.toString(xVal*yVal));
}
else if(event.getSource().equals(divideButton)) { //Button pressed was division
if(yVal == 0) { //Is the yVal (bottom number) 0?
result.setForeground(Color.red); //Yes it is, print message
result.setText("CAN'T DIVIDE BY ZERO!");
clear();
}
else
result.setText(Integer.toString(xVal/yVal)); //No it's not, do the math
}
else if(event.getSource().equals(subtractButton)) { //Button pressed was subtraction
result.setText(Integer.toString(xVal-yVal));
}
else if(event.getSource().equals(addButton)) { //Button pressed was addition
result.setText(Integer.toString(xVal+yVal));
}
}
}
And here is my current main:
public class DemoCalculator {
public static void main(String[] args) {
JFrame mainFrame = new JFrame("Calculators");
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Calculator calc = new Calculator();
Calculator2 calc2 = new Calculator2();
JPanel calcPanel = new JPanel(new BorderLayout());
JPanel calcPanel2 = new JPanel(new BorderLayout());
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));
//calcPanel.add(calc, BorderLayout.CENTER);
//calcPanel2.add(calc2, BorderLayout.CENTER);
mainPanel.add(calcPanel);
mainPanel.add(calcPanel2);
calcPanel.add(mainPanel);
mainFrame.getContentPane().add(calcPanel);
mainFrame.getContentPane().add(calcPanel2);
mainFrame.pack();
mainFrame.setVisible(true);
}
}

You should just create a single JFrame and put your Calculator classes each into a single JPanel.Don't create a new JFrame for each class.
public class Calculator{
JPanel panel;
public Calculator(){
panel = new JPanel();
/*
* Add labels and buttons etc.
*/
panel.add(buttons);
panel.add(labels);
}
//Method to return the JPanel
public JPanel getPanel(){
return panel;
}
}
Then add the panels to your JFrame in your testers class using whatever layout best suits your needs.
public class DemoCalculator {
public static void main(String[] args) {
JPanel cal1,cal2;
JFrame frame = new JFrame("Calculators");
frame.add(cal1 = new Calculator().getPanel(),new BorderLayout().EAST);
frame.add(cal2 = new Calculator2().getPanel(),new BorderLayout().WEST);
frame.setSize(1000,600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setResizable(false);
frame.setVisible(true);
}
}

How to declare variable to hold value of JTextField?

I'm doing coding for Food Ordering GUI. I would like to ask few questions. I would like to ask that how should I declare variable to hold value for tfPrice1, tfPrice2, tfPrice3? What should I do to make the "Place Order" button so that when it is pressed it will sum up the values contained in the JTextFields? Below is my code.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class FoodOrder1 extends JFrame
{
JButton riceBtn,noodleBtn,soupBtn;
JTextField display,total,tfPrice1,tfPrice2,tfPrice3;
JPanel mp,p1,p2,p3,p4,p5,p6,p7,p8;
JLabel dsp,ttl,rLbl,nLbl,sLbl,prc1,prc2,prc3;
int rice=3 , noodle=3 , soup=4;
int Total , price1=Integer.parseInt(tfPrice1), price2=Integer.parseInt(tfPrice2) , price3=Integer.parseInt(tfPrice3);
public FoodOrder1()
{
Container pane = getContentPane();
mp = new JPanel();
mp.setLayout(new GridLayout(14,1));
pane.add(mp);
p1 = new JPanel();
p1.setLayout(new GridLayout(1,1));
rLbl = new JLabel("Rice");
rLbl.setFont(new Font("Myraid Pro",Font.BOLD,14));
riceBtn = new JButton("Fried Rice " + "RM3");
p1.add(riceBtn);
riceBtn.addActionListener(new MyAction());
p1.add(rLbl);
p1.add(riceBtn);
p2 = new JPanel();
p2.setLayout(new GridLayout(1,2));
nLbl = new JLabel("Noodle");
nLbl.setFont(new Font("Myraid Pro",Font.BOLD,14));
noodleBtn = new JButton("Tomato Noodle " + "RM3");
noodleBtn.addActionListener(new MyAction());
p2.add(nLbl);
p2.add(noodleBtn);
p3 = new JPanel();
p3.setLayout(new GridLayout(1,2));
sLbl = new JLabel("Soup");
sLbl.setFont(new Font("Myraid Pro",Font.BOLD,14));
soupBtn = new JButton("Tomyam Soup " + "RM4");
soupBtn.addActionListener(new MyAction());
p3.add(sLbl);
p3.add(soupBtn);
p4 = new JPanel();
p4.setLayout(new GridLayout(1,2));
prc1 = new JLabel("Price of Fried Rice");
prc1.setFont(new Font("Myraid Pro",Font.BOLD,14));
tfPrice1 = new JTextField(10);
p4.add(prc1);
p4.add(tfPrice1);
tfPrice1.setEditable(false);
p5 = new JPanel();
p5.setLayout(new GridLayout(1,2));
prc2 = new JLabel("Price of Tomato Noodle");
prc2.setFont(new Font("Myraid Pro",Font.BOLD,14));
tfPrice2 = new JTextField(10);
p5.add(prc2);
p5.add(tfPrice2);
tfPrice2.setEditable(false);
p6 = new JPanel();
p6.setLayout(new GridLayout(1,2));
prc3 = new JLabel("Price of Tomyam Soup");
prc3.setFont(new Font("Myraid Pro",Font.BOLD,14));
tfPrice3 = new JTextField(10);
p6.add(prc3);
p6.add(tfPrice3);
tfPrice3.setEditable(false);
p7 = new JPanel();
p7.setLayout(new FlowLayout());
poBtn = new JButton("Place Order");
poBtn.setFont(new Font("Myraid Pro",Font.PLAIN,14));
poBtn.addActionListener(new MyAction2());
rstBtn = new JButton("Reset");
rstBtn.setFont(new Font("Myraid Pro",Font.PLAIN,14));
rstBtn.addActionListener(new MyAction3());
p7.add(poBtn);
p7.add(rstBtn);
p8 = new JPanel();
p8.setLayout(new GridLayout(1,2));
ttl = new JLabel("Total (RM)");
ttl.setFont(new Font("Myraid Pro",Font.BOLD,14));
total = new JTextField(10);
p8.add(ttl);
p8.add(total);
total.setEditable(false);
mp.add(p1);
mp.add(p2);
mp.add(p3);
mp.add(p4);
mp.add(p5);
mp.add(p6);
mp.add(p7);
mp.add(p8);
}
public class MyAction implements ActionListener
{
int counter=0;
public void actionPerformed(ActionEvent e)
{
if (e.getSource() == riceBtn)
{
counter++;
tfPrice1.setText("RM" + String.valueOf(counter*rice));
}
if (e.getSource() == noodleBtn)
{
counter++;
tfPrice2.setText("RM" + String.valueOf(counter*noodle));
}
if (e.getSource() == soupBtn)
{
counter++;
tfPrice3.setText("RM" + String.valueOf(counter*soup));
}
}
}
public class MyAction2 implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
price1.setText(String.valueOf(tfPrice1));
price2.setText(String.valueOf(tfPrice2));
price3.setText(String.valueOf(tfPrice3));
Total = price1+price2+price3;
total.setText(String.valueOf(Total));
}
}
public class MyAction3 implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == rstBtn)
{
tfPrice1.setText("");
tfPrice2.setText("");
tfPrice3.setText("");
total.setText("");
}
}
}
public static void main(String [] args)
{
FoodOrder1 f = new FoodOrder1();
f.setVisible(true);
f.pack();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(1000,800);
}
}

You don't need a variable to hold the value. Just extract the text from the text boxes whenever you need the value.
double totalPrice = 0.0;
totalPrice += Double.parseDouble(tfPrice1.getText());
totalPrice += Double.parseDouble(tfPrice2.getText());
totalPrice += Double.parseDouble(tfPrice3.getText());
total.setText(String.valueOf(totalPrice));

here is code to hold textfield value to some string
String data = txtdata.getText();
Take data entered to txtdata jTextField into data which is of string datatype

Fixed size of buttons

There is a JPanel with buttons and textField. TextField filters unnecessary buttons by name. But after delete the size of rest buttons is changing.
The height of buttons must not change after filtering in the textField. How to achieve this?
public class TestViewer {
public static void main(String[] args) {EventQueue.invokeLater(new Runnable() {
public void run() {
JDialog dialog = new TestDialog();
dialog.setLocationRelativeTo(null);
dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
dialog.setTitle("Type text and press Enter");
dialog.setSize(300, 700);
dialog.setVisible(true);
dialog.setLocationRelativeTo(null);
dialog.setModal(true);
}
});
}
}
class TestDialog extends JDialog {
public TestDialog() {
getContentPane().add(new JPan
el(), BorderLayout.CENTER);
getContentPane().add(createBtnPanel(), BorderLayout.CENTER);
}
private JPanel createBtnPanel() {
int n = 100;
Final String ArrButtonNames[] = new String[n];
for (int h = 0; h < ArrButtonNames.length; h++) {
if ((h%2)==0){
ArrButtonNames[h]="Filter"+h;
}
else{
ArrButtonNames[h]="Button"+h;
}
}
final JButton ArrButton[] = new JButton[n];
final JPanel btnPanel = new JPanel(new GridLayout(0, ArrButtonNames.length, 1,1));
btnPanel.setLayout(new GridLayout(0, 1));
final JTextField textField = new JTextField();
textField.setColumns(23);
btnPanel.add(textField);
for (int i = 0; i < ArrButtonNames.length; i++) {
String btnString = ArrButtonNames[i];
JButton button = new JButton(btnString);
Dimension d = button.getPreferredSize();
d.setSize(d.getWidth(), d.getHeight()*1);
button.setPreferredSize(d);
button.setSize(d);
button.setMinimumSize(d);
button.setMaximumSize(d);
btnPanel.add(button);
ArrButton[i] = button;
}
textField.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
for(int k = 0; k < ArrButtonNames.length; k++) {
if(ArrButtonNames[k].indexOf(textField.getText())==-1) {
btnPanel.remove(ArrButton[k]);
btnPanel.revalidate();
btnPanel.repaint();
}
}
}
});
JPanel MainPanel = new JPanel();
MainPanel.setLayout(new BorderLayout());
MainPanel.add(btnPanel, BorderLayout.NORTH);
final JScrollPane scrollPane = new JScrollPane(btnPanel);
MainPanel.add(scrollPane, BorderLayout.CENTER);
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
return MainPanel;
}
}

You have that effect, because you use GridLayout, which resize components to fill whole cell.
For your purposes I recommend you to use GridBagLayout, that can do what you want.
Try to use next code for filling your btnPanel instead of yours:
final JButton ArrButton[] = new JButton[n];
final JPanel btnPanel = new JPanel();
GridBagConstraints c = new GridBagConstraints();
c.anchor = GridBagConstraints.WEST;
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 1;
c.gridx=0;
c.gridy=0;
btnPanel.setLayout(new GridBagLayout());
final JTextField textField = new JTextField();
btnPanel.add(textField,c);
for (int i = 0; i < ArrButtonNames.length; i++) {
String btnString = ArrButtonNames[i];
JButton button = new JButton(btnString);
c.gridy ++;
btnPanel.add(button,c);
ArrButton[i] = button;
}
c.fill = GridBagConstraints.BOTH;
c.weighty = 1;
c.gridy ++;
btnPanel.add(new JLabel(""),c);
And it looks like:
ALso use pack() method instead of setSize(...), and don't use setPreferedSize(...) and others size methods read about that here.

java JFame will not work when started by actionPerformed

I have been googling an sherthing for an solution to this problem a lot but can't find any answer how to fix this. My problem is that when i start a new jframe from an actionevent from pressing a button the class white the JFrame opens but then the programs starts to freeze and the pop up windows stays blank.
Her is the cod i apologize if there is some bad programing or some words in swedish:
The start upp class:
import java.util.ArrayList;
public class maineClassen {
ArrayList<infoClass> Infon = new ArrayList<>();
public static void main (String [] args)
{
referenser referens = new referenser();
Startskärmen ss = new Startskärmen(referens);
}
}
The "startskärm" the first screen to com to:
public class Startskärmen extends JFrame implements ActionListener {
referenser referens;
ArrayList<infoClass> Infon;
JButton öppna = new JButton("open");
JButton ny = new JButton("create new");
JButton radera = new JButton("erase");
JScrollPane pane = new JScrollPane();
DefaultListModel mod = new DefaultListModel();
JList list = new JList(mod);
JScrollPane sp = new JScrollPane(list);
JLabel texten = new JLabel("pre-alpha 0.1");
public Startskärmen(referenser re)
{
//references should be sent by itself or received
referens = re;
Infon = referens.getInfoReferens();
//build up the window
JPanel labelPanel = new JPanel();
labelPanel.setLayout(new BoxLayout(labelPanel, BoxLayout.LINE_AXIS));
labelPanel.setBorder(BorderFactory.createEmptyBorder(10,10,0,10));
labelPanel.add(texten);
JPanel scrollPanel = new JPanel();
scrollPanel.setLayout(new BoxLayout(scrollPanel, BoxLayout.LINE_AXIS));
scrollPanel.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
scrollPanel.add(sp);// man kan ocksä sätta in --> pane <--
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new BoxLayout(buttonPanel, BoxLayout.LINE_AXIS));
buttonPanel.setBorder(BorderFactory.createEmptyBorder(0, 10, 10, 10));
buttonPanel.add(Box.createHorizontalGlue());
buttonPanel.add(öppna);
buttonPanel.add(Box.createRigidArea(new Dimension(10, 0)));
buttonPanel.add(ny);
buttonPanel.add(Box.createRigidArea(new Dimension(10, 0)));
buttonPanel.add(radera);
Container contentPane = getContentPane();
contentPane.add(labelPanel,BorderLayout.NORTH);
contentPane.add(scrollPanel, BorderLayout.CENTER);
contentPane.add(buttonPanel, BorderLayout.PAGE_END);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setSize(500, 500);
//adda action listener
ny.addActionListener(this);
öppna.addActionListener(this);
radera.addActionListener(this);
//skapaNyIC();
}
infoClass hh;
public void skapaNyIC()
{
Infon.add(new infoClass());
Infon.get(Infon.size() -1).referenser(Infon); //Infon.get(Infon.size() -1)
mod.addElement(Infon.get(Infon.size() -1).getName());
}
public void actionPerformed(ActionEvent e) {
if(e.getSource() == ny)
{
skapaNyIC();
}
else if(e.getSource() == öppna)
{
JOptionPane.showMessageDialog(texten,"This function doesn't exist yet");
}
else if(e.getSource() == radera)
{
JOptionPane.showMessageDialog(texten, "This function doesn't exist yet");
}
}
}
The class where the information will be stored and that creates the window (class) that will show the info:
public class infoClass {
ArrayList<infoClass> Infon;
private infoClass ic;
private String namn = "inget namn existerar";
private String infoOmInfo = null;
private int X_Rutor = 3;
private int Y_Rutor = 3;
private String[] information = new String[X_Rutor + Y_Rutor];
//info om dessa värden
public infoClass()
{
}
public void referenser(infoClass Tic)
{
ic = Tic;
infonGrafiskt ig = new infonGrafiskt(ic);
}
public void referenser(ArrayList<infoClass> Tic)
{
ic = Tic.get((Tic.size() - 1 ));
System.out.println("inna");
infonGrafiskt ig = new infonGrafiskt(ic);
ig.setVisible(true);
System.out.println("efter");
}
public String namnPåInfon()
{
return namn;
}
//namnen
public String getName()
{
return namn;
}
public void setNamn(String n)
{
namn = n;
}
//xkordinaterna
public int getX_Rutor()
{
return X_Rutor;
}
public void setX_Rutor(int n)
{
X_Rutor = n;
}
//y kordinaterna
public int getY_Rutor()
{
return Y_Rutor;
}
public void setY_Rutor(int n)
{
Y_Rutor = n;
}
//informationen
public String[] getInformationen()
{
return information;
}
public void setInformationen(String[] n)
{
information = n;
}
//infoOmInfo
public String getinfoOmInfo()
{
return infoOmInfo;
}
public void setinfoOmInfo(String n)
{
infoOmInfo = n;
}
}
The class that will show the info created by the window a bow:
public class infonGrafiskt extends JFrame implements ActionListener{
infoClass ic;
infonGrafiskt ig;
//tillrutnätet
JPanel panel = new JPanel(new SpringLayout());
boolean pausa = true;
//sakerna till desigen grund inställningar GI = grund inställningar
JButton GIklarKnapp = new JButton("Spara och gå vidare");
JTextField GInamn = new JTextField();
JLabel GINamnText = new JLabel("Namn:");
JTextField GIxRutor = new JTextField();
JLabel GIxRutorText = new JLabel("Antal rutor i X-led:");
JTextField GIyRutor = new JTextField();
JLabel GIyRutorText = new JLabel("Antal rutor i Y-led:");
JLabel GIInfo = new JLabel("Grund Inställningar");
// de olika framm:arna
JFrame GIframe = new JFrame("SpringGrid");
JFrame frame = new JFrame("SpringGrid");
//info om denna infon som finns här
JTextArea textArea = new JTextArea();
JScrollPane infoOmClasen = new JScrollPane(textArea); //hadde text area förut
JLabel infoRutan = new JLabel("Informatin om denna resuldatdatabank:");
//namnet på informationsdatabanken
JLabel namnetPåInfot = new JLabel("Namnet på denna resuldatdatabas.");
JButton ändraNamn = new JButton("Ändra namn");
JButton sparaAllt = new JButton("Spara allt");
public infonGrafiskt(infoClass Tic)
{
//få startinfo
namnOchRutor();
ic = Tic;
//skapar om rutan
JPanel p1 = new JPanel();
p1.setLayout(new BoxLayout(p1, BoxLayout.PAGE_AXIS));
p1.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
namnetPåInfot.setFont(new Font("Dialog",1,22));
p1.add(namnetPåInfot);
//pausa programet tills grundinställningarna är instälda
int m =1;
try {
while(m ==1)
{
Thread.sleep(100);
if(pausa == false)
m =2;
}
} catch(InterruptedException e) {
}
//Create the panel and populate it. skapar den så alla kommer åt den
//JPanel panel = new JPanel(new SpringLayout());
for (int i = 0; i < ic.getX_Rutor()*ic.getY_Rutor(); i++) {
JTextField textField = new JTextField(Integer.toString(i));
panel.add(textField);
}
//Lay out the panel.
SpringUtilities.makeGrid(panel,
ic.getY_Rutor(), ic.getX_Rutor(), //rows, cols
5, 5, //initialX, initialY
5, 5);//xPad, yPad
//set up the window.
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//p1.add(ändraNamn);
JPanel p2 = new JPanel();
p2.setLayout(new BoxLayout(p2, BoxLayout.PAGE_AXIS));
p2.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
p2.add(infoRutan);
infoOmClasen.setPreferredSize(new Dimension(0,100));
p2.add(infoOmClasen);
JPanel p3 = new JPanel();
p3.setLayout(new FlowLayout());
p3.setBorder(BorderFactory.createEmptyBorder(0,10,10,10));
p3.setLayout(new BoxLayout(p3, BoxLayout.LINE_AXIS));
p3.add(ändraNamn);
p3.add(sparaAllt);
//Set up the content pane.
panel.setOpaque(true); //content panes must be opaque
frame.setLayout(new BoxLayout(frame.getContentPane(), BoxLayout.PAGE_AXIS));
frame.add(p1);
frame.add(p2);
frame.add(panel);//frame.setContentPane(panel);
frame.add(p3);
//Display the window.
frame.pack();
sparaAllt.addActionListener(this);
ändraNamn.addActionListener(this);
}
private void namnOchRutor()
{
System.out.println("inna 2");
//sättigång action listner
GIklarKnapp.addActionListener(this);
frame.setVisible(false);
//frameStart.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GIframe.setLayout(new BoxLayout(GIframe.getContentPane(), BoxLayout.PAGE_AXIS));
JPanel GIP0 = new JPanel();
GIP0.setLayout(new BoxLayout(GIP0,BoxLayout.LINE_AXIS));
GIP0.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
GIP0.add(GIInfo);
GIInfo.setFont(new Font("Dialog",1,22));
JPanel GIP1 = new JPanel();
GIP1.setLayout(new BoxLayout(GIP1,BoxLayout.LINE_AXIS));
GIP1.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
GIP1.add(GINamnText);
GIP1.add(Box.createRigidArea(new Dimension(10, 0)));
GIP1.add(GInamn);
JPanel GIP2 = new JPanel();
GIP2.setLayout(new BoxLayout(GIP2,BoxLayout.LINE_AXIS));
GIP2.setBorder(BorderFactory.createEmptyBorder(0,10,10,10));
GIP2.add(GIxRutorText);
GIP2.add(Box.createRigidArea(new Dimension(10, 0)));
GIP2.add(GIxRutor);
JPanel GIP3 = new JPanel();
GIP3.setLayout(new BoxLayout(GIP3,BoxLayout.LINE_AXIS));
GIP3.setBorder(BorderFactory.createEmptyBorder(0,10,10,10));
GIP3.add(GIyRutorText);
GIP3.add(Box.createRigidArea(new Dimension(10, 0)));
GIP3.add(GIyRutor);
JPanel GIP4 = new JPanel();
GIP4.setLayout(new BoxLayout(GIP4,BoxLayout.LINE_AXIS));
GIP4.setBorder(BorderFactory.createEmptyBorder(0,10,10,10));
GIP4.add(GIklarKnapp);
System.out.println("inna 3");
//lägga till sakerna gurund instllnings framen
GIframe.add(GIP0);
GIframe.add(GIP1);
GIframe.add(GIP2);
GIframe.add(GIP3);
GIframe.add(GIP4);
//desigen
System.out.println("inna 4");
GIframe.pack();
GIframe.setVisible(true);
System.out.println("inna5");
}
/*public static void main (String [] args)
{
infoClass i = new infoClass();
infonGrafiskt ig = new infonGrafiskt(i);
}*/
public void referenserna( infonGrafiskt Tig)
{
ig = Tig;
}
private void skrivTillbaka()
{
String[] tillfäligString = ic.getInformationen();
Component[] children = panel.getComponents();
for (int i=0;i<children.length;i++){
if (children[i] instanceof JTextField){
((JTextField)children[i]).setText(tillfäligString[i]);
System.out.println(tillfäligString[i]);
}
}
namnetPåInfot.setText(ic.getName());
textArea.setText(ic.getinfoOmInfo());
}
#Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == GIklarKnapp)
{
//skicka x och y antal ett och så
ic.setNamn(GInamn.getText());
ic.setX_Rutor(Integer.parseInt(GIxRutor.getText()));
ic.setY_Rutor(Integer.parseInt( GIyRutor.getText()));
namnetPåInfot.setText(ic.getName());
pausa = false;
GIframe.setVisible(false);
frame.setVisible(true);
}
if(e.getSource() == sparaAllt)
{
String[] tillfäligString = ic.getInformationen();
Component[] children = panel.getComponents();
for (int i=0;i<children.length;i++){
if (children[i] instanceof JTextField){
tillfäligString[i] = ((JTextField)children[i]).getText();
System.out.println(tillfäligString[i]);
}
}
ic.setInformationen(tillfäligString);
ic.setNamn(namnetPåInfot.getText());
ic.setinfoOmInfo(textArea.getText());
}
if(e.getSource() == ändraNamn)
{
skrivTillbaka();
}
}
}
so my problem now is that i can't create a new "infoclass" that will show the info in the "infoGrafikst" class. with the code:
Infon.add(new infoClass());
Infon.get(Infon.size() -1).referenser(Infon); //Infon.get(Infon.size() -1)
mod.addElement(Infon.get(Infon.size() -1).getName());
that am triggered by an button click.
Sorry for all the cod, but didn't know how to show my problem in another way.
Thanks a lot. I did find out that it was this code
int m =1;
try {
while(m ==1) {
Thread.sleep(100);
if(pausa == false)
m =2;
}
} catch(InterruptedException e) {
}
that made it not work...

Well I haven't gone through your code may be beacuse I am too lazy to read pages of code.Well i think the new window you are creating must be interfering with EDT.
Well i have done a short example which may help you, and its smooth:
import java.awt.event.ActionEvent;
import javax.swing.*;
public class FrameLaunch {
void inti(){
final JFrame f=new JFrame();
final JFrame f2=new JFrame();
final JTextArea ja=new JTextArea();
JButton b =new JButton("press for a new JFrame");
f2.add(b);
f2.pack();
f2.setVisible(true);
b.addActionListener(new java.awt.event.ActionListener()
{
public void actionPerformed(ActionEvent e) {
f2.setVisible(false);
f.setSize(200,200);
ja.setText("THIS IS NOT FROZEN");
f.add(ja);
f.setVisible(true);
f.setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
}
});
}
public static void main(String[] args)
{
FrameLaunch frame = new FrameLaunch();
frame.inti();
}
}

How do I ask "if there is an exception, then do this" java

I wanted to ask that if an exception occurs, then display a certain String in the textfield. When I try using a try, catch IOException, it gives me an error that cannot have a catch in the same body as a try. This should probably be done in the action performed method.
GUI:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
public class GUI extends JFrame implements ActionListener
{
JPanel buttonPanel, topPanel, operationPanel;
JTextField display = new JTextField(20);
doMath math = new doMath();
String s = "";
String b= "";
//int counter;
JButton Num1;
JButton Num2;
JButton Num3;
JButton Num4;
JButton Num5;
JButton Num6;
JButton Num7;
JButton Num8;
JButton Num9;
JButton Num0;
JButton Add;
JButton Sub;
JButton Mult;
JButton Div;
JButton Eq;
JButton Clr;
JButton Space;
public GUI()
{
super("Calculator");
setSize(400,400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new GridLayout (2,1));
buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(5, 4));
buttonPanel.add(Num1 = new JButton("1"));
buttonPanel.add(Num2 = new JButton("2"));
buttonPanel.add(Num3 = new JButton("3"));
buttonPanel.add(Num4 = new JButton("4"));
buttonPanel.add(Num5 = new JButton("5"));
buttonPanel.add(Num6 = new JButton("6"));
buttonPanel.add(Num7 = new JButton("7"));
buttonPanel.add(Num8 = new JButton("8"));
buttonPanel.add(Num9 = new JButton("9"));
buttonPanel.add(Num0 = new JButton("0"));
buttonPanel.add(Clr = new JButton("C"));
buttonPanel.add(Eq = new JButton("="));
buttonPanel.add(Add = new JButton("+"));
buttonPanel.add(Sub = new JButton("-"));
buttonPanel.add(Mult = new JButton("*"));
buttonPanel.add(Div = new JButton("/"));
buttonPanel.add(Space = new JButton("Space"));
Num1.addActionListener(this);
Num2.addActionListener(this);
Num3.addActionListener(this);
Num4.addActionListener(this);
Num5.addActionListener(this);
Num6.addActionListener(this);
Num7.addActionListener(this);
Num8.addActionListener(this);
Num9.addActionListener(this);
Num0.addActionListener(this);
Clr.addActionListener(this);
Eq.addActionListener(this);
Add.addActionListener(this);
Sub.addActionListener(this);
Mult.addActionListener(this);
Div.addActionListener(this);
Space.addActionListener(this);
topPanel = new JPanel();
topPanel.setLayout(new FlowLayout());
topPanel.add(display);
add(mainPanel);
mainPanel.add(topPanel, BorderLayout.NORTH);
mainPanel.add(buttonPanel, BorderLayout.SOUTH);
setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
JButton source = (JButton)e.getSource();
String text = source.getText();
try{
if (text.equals("="))
{
doMath math = new doMath();
b = b.replaceAll("\\s+", " ");
int result = math.doMath1(b);
String answer = ""+result;
display.setText(answer);
}
else if(text.equals("Space"))
{
b+=" ";
display.setText(b);
}
else if (text.equals("C"))
{
b = "";
display.setText(b);
}
else if (text.equals("+") || text.equals("-") || text.equals("*") || text.equals("/"))
{
b += (" "+(text)+ " ");
display.setText(b);
}
else
{
b += (text);
display.setText(b);
}
}
catch(IOException o)
{display.setText(b);}
}
}

When I try using a try, catch IOException, it gives me an error that
cannot have a catch in the same body as a try
The error is self-explanatory. The following code is illegal:
try{
catch(Exception ex){
}
}
You want this:
try{
//stuff i need to do
} //close the try
catch(IOException ioex)
{
//log and recover
}
=UPDATE
Based on the code block below (the same that OP is talking about in case it is changed later) The actual error message that is being displayed is this:
Unreachable catch block for IOException. This exception is never
thrown from the try statement body GUI.java
The reason this occurs is that there is nothing that generates an IOException in your code, the only exception you can define without an explicit throw from one of your functions is the top level Exception.
public class GUI extends JFrame implements ActionListener
{
JPanel buttonPanel, topPanel, operationPanel;
JTextField display = new JTextField(20);
doMath math = new doMath();
String s = "";
String b= "";
//int counter;
JButton Num1;
JButton Num2;
JButton Num3;
JButton Num4;
JButton Num5;
JButton Num6;
JButton Num7;
JButton Num8;
JButton Num9;
JButton Num0;
JButton Add;
JButton Sub;
JButton Mult;
JButton Div;
JButton Eq;
JButton Clr;
JButton Space;
public GUI()
{
super("Calculator");
setSize(400,400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new GridLayout (2,1));
buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(5, 4));
buttonPanel.add(Num1 = new JButton("1"));
buttonPanel.add(Num2 = new JButton("2"));
buttonPanel.add(Num3 = new JButton("3"));
buttonPanel.add(Num4 = new JButton("4"));
buttonPanel.add(Num5 = new JButton("5"));
buttonPanel.add(Num6 = new JButton("6"));
buttonPanel.add(Num7 = new JButton("7"));
buttonPanel.add(Num8 = new JButton("8"));
buttonPanel.add(Num9 = new JButton("9"));
buttonPanel.add(Num0 = new JButton("0"));
buttonPanel.add(Clr = new JButton("C"));
buttonPanel.add(Eq = new JButton("="));
buttonPanel.add(Add = new JButton("+"));
buttonPanel.add(Sub = new JButton("-"));
buttonPanel.add(Mult = new JButton("*"));
buttonPanel.add(Div = new JButton("/"));
buttonPanel.add(Space = new JButton("Space"));
Num1.addActionListener(this);
Num2.addActionListener(this);
Num3.addActionListener(this);
Num4.addActionListener(this);
Num5.addActionListener(this);
Num6.addActionListener(this);
Num7.addActionListener(this);
Num8.addActionListener(this);
Num9.addActionListener(this);
Num0.addActionListener(this);
Clr.addActionListener(this);
Eq.addActionListener(this);
Add.addActionListener(this);
Sub.addActionListener(this);
Mult.addActionListener(this);
Div.addActionListener(this);
Space.addActionListener(this);
topPanel = new JPanel();
topPanel.setLayout(new FlowLayout());
topPanel.add(display);
add(mainPanel);
mainPanel.add(topPanel, BorderLayout.NORTH);
mainPanel.add(buttonPanel, BorderLayout.SOUTH);
setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
JButton source = (JButton)e.getSource();
String text = source.getText();
try{
if (text.equals("="))
{
doMath math = new doMath();
b = b.replaceAll("\\s+", " ");
int result = math.doMath1(b);
String answer = ""+result;
display.setText(answer);
}
else if(text.equals("Space"))
{
b+=" ";
display.setText(b);
}
else if (text.equals("C"))
{
b = "";
display.setText(b);
}
else if (text.equals("+") || text.equals("-") || text.equals("*") || text.equals("/"))
{
b += (" "+(text)+ " ");
display.setText(b);
}
else
{
b += (text);
display.setText(b);
}
}
catch(IOException o)
{display.setText(b);}
}
}